William Sofield and Emma O'Neill have been designing extraordinary interiors together since the 1990s. When I interviewed William Sofield years ago for an article in Vogue Hommes International, he told me he had a theory that there were several Andy Warhols. “He was almost like Santa Claus, where there’s a different one in every department store,” Sofield said. “I mean, how does one man go to twelve parties a night?”